One of a trick a website operator can use to evade hostname-based adblockers is by putting the ad-serving domain as a cname entry in one of their subdomain. Sin

One of a trick a website operator can use to evade hostname-based adblockers is by putting the ad-serving domain as a cname entry in one of their subdomain. Since the ad now served from a subdomain of their website, it won't get blocked unless the dns adblocker did deep inspection on nested cname entries.